Taper talk: Chatter about Federal Reserve tapering caused some jitters again Tuesday. Atlanta Fed president Dennis Lockhart and Chicago Fed president Charles Evans both hinted that the Fed could begin easing its bond buying program as early as next month.

While speaking to reporters, Evans said he wouldn't rule out the possibility of dialing back the bond program next month, but reiterated that the Fed's decision is going to depend on economic data and the pace of the recovery.

Evans is a voting member on the Fed's monetary policy committee, while Lockhart is not. But the market has paid attention to comments from all Fed members recently for clues about the central bank's next move.

The Fed's stimulus policies, including its bond purchase program, known as quantitative easing, have been widely credited as a major factor in driving stocks higher over the past few years.

What's moving: The vast majority of large U.S.-traded companies have already reported quarterly results, but a few more are trickling in and generating plenty of buzz among traders on StockTwits.

Shares of Molson Coors Brewing(TAP) rose, after the brewer reported strong earnings and sales, helped by a 20% jump in beer volume.

In other corporate news, shares of The Washington Post (WPO) rose after Amazon.com(AMZN) founder Jeff Bezos said he was buying the company's world-renowned newspaper business. Bezos is buying the company's flagship paper -- The Washington Post -- and other print properties for $250 million.

BATS exchange temporarily halts orders, resumes:The BATS BZX exchange stopped accepting trader orders for nearly an hour Tuesday afternoon while it was investigating system issues. The exchange, the nation's third largest after the New York Stock Exchange and Nasdaq, resumed taking order at 2 p.m. ET.